We recently created a custom large Moleskine cover with a built in pen sheath. Over the years we've occasionally made covers that included a pen holder or loop, but were never really happy with it. This one, however, came out particularly nice and we're thinking of making it a regular option for the covers. I especially love the contrast between the brown Horween Chromexcel and the Mesa (Horween Derby) which is similar to the Chromexcel but full of extra character.